MCQ
Alcohols having molecular formula $C _3 H _8 O$, can be :
- AOnly primary
- BOnly secondary
- ✓Primary and secondary
- DPrimary, secondary and tertiary
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$Mg^{2+} + 2{e^ - } \to Mg(s)\;E^o = - 2.37\,V$
$Cu^{2+} + 2e^- \to Cu(s)\;E^o = + 0.34\,V$
Assertion $(A)$ : $\mathrm{S}_{\mathrm{N}} 2$ reaction of $\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{Br}$ occurs more readily than the $\mathrm{S}_{\mathrm{N}} 2$ reaction of $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$.
Reason $(R)$ : The partially bonded unhybridized p-orbital that develops in the trigonal bipyramidal transition state is stabilized by conjugation with the phenyl ring.
In the light of the above statements, choose the most appropriate answer from the options given below:
